/*
*    Qizx/open 3.0 beta
*
* This code is the open-source version of Qizx.
* Copyright (C) 2004-2009 Axyana Software -- All rights reserved.
*
* The contents of this file are subject to the Mozilla Public License 
*  Version 1.1 (the "License"); you may not use this file except in 
*  compliance with the License. You may obtain a copy of the License at
*  http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
*  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
*  for the specific language governing rights and limitations under the
*  License.
*
* The Initial Developer of the Original Code is Xavier Franc - Axyana Software.
*
*/
using System;
using EvaluationException = System.Qizx.Api.EvaluationException;
using QizxException = System.Qizx.Api.QizxException;
using Comparison = System.Qizx.Util.Basic.Comparison;
using Conversion = System.Qizx.Xdm.Conversion;
using BaseValue = System.Qizx.XQuery.BaseValue;
using ComparisonContext = System.Qizx.XQuery.ComparisonContext;
using XQItem = System.Qizx.XQuery.XQItem;
using XQItemType = System.Qizx.XQuery.XQItemType;
using XQType = System.Qizx.XQuery.XQType;
namespace System.Qizx.XQuery.Dt
{
	
	public abstract class BooleanValue:BaseValue
	{
		public abstract bool Value{get;}
		public override XQItem Item
		{
			get
			{
				return Value?TRUE:FALSE;
			}
			
		}
		public override double ValueAsDouble
		{
			get
			{
				return Conversion.toDouble(ValueAsBoolean);
			}
			
		}
		public override float ValueAsFloat
		{
			get
			{
				return Conversion.toFloat(ValueAsBoolean);
			}
			
		}
		public override long ValueAsInteger
		{
			get
			{
				return Conversion.toInteger(ValueAsBoolean);
			}
			
		}
		public override string ValueAsString
		{
			get
			{
				return Conversion.ToString(ValueAsBoolean);
			}
			
		}
		public override System.Object Object
		{
			get
			{
                return Value;
            }
			
		}
		public static SingleBoolean TRUE = new SingleBoolean(true);
		
		public static SingleBoolean FALSE = new SingleBoolean(false);
		
		public BooleanValue()
		{
			itemType = XQType.BOOLEAN;
		}
		
		public override int CompareTo(XQItem that, ComparisonContext context, int flags)
		{
			XQItemType thatType = that.ItemType;
			switch (thatType.quickCode())
			{
				
				case XQType.QT_UNTYPED: 
					if ((flags & System.Qizx.XQuery.XQItemCompareType.COMPAR_VALUE) != 0)
						return Comparison.ERROR;
					goto case XQType.QT_BOOL;
				
				case XQType.QT_BOOL: 
					bool b = that.ValueAsBoolean;
					return (ValueAsBoolean == b)?Comparison.EQ:(b?Comparison.LT:Comparison.GT);
				
				default: 
					return Comparison.ERROR;
				
			}
		}
		
		public  override bool Equals(System.Object obj)
		{
			if (obj is BooleanValue)
			{
				BooleanValue bob = (BooleanValue) obj;
				return Value == bob.Value;
			}
			return false;
		}
		
		public override int GetHashCode()
		{
			return Value?1:0;
		}
	}
}